628827816961 has 4 divisors (see below), whose sum is σ = 629134116052. Its totient is φ = 628521517872.

The previous prime is 628827816893. The next prime is 628827816971. The reversal of 628827816961 is 169618728826.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 299598590736 + 329229226225 = 547356^2 + 573785^2 .

It is a cyclic number.

It is not a de Polignac number, because 628827816961 - 2⁷ = 628827816833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628827816893 and 628827816902.

It is not an unprimeable number, because it can be changed into a prime (628827816971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153146466 + ... + 153150571.

It is an arithmetic number, because the mean of its divisors is an integer number (157283529013).

Almost surely, 2^628827816961 is an apocalyptic number.

It is an amenable number.

628827816961 is a deficient number, since it is larger than the sum of its proper divisors (306299091).

628827816961 is a wasteful number, since it uses less digits than its factorization.

628827816961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306299090.

The product of its digits is 27869184, while the sum is 64.

The spelling of 628827816961 in words is "six hundred twenty-eight billion, eight hundred twenty-seven million, eight hundred sixteen thousand, nine hundred sixty-one".